564531561 has 24 divisors (see below), whose sum is σ = 898750944. Its totient is φ = 338607360.

The previous prime is 564531509. The next prime is 564531577. The reversal of 564531561 is 165135465.

564531561 is a `hidden beast` number, since 5 + 64 + 5 + 31 + 561 = 666.

It is not a de Polignac number, because 564531561 - 2⁷ = 564531433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (564531061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19791 + ... + 38996.

It is an arithmetic number, because the mean of its divisors is an integer number (37447956).

Almost surely, 2^564531561 is an apocalyptic number.

It is an amenable number.

564531561 is a deficient number, since it is larger than the sum of its proper divisors (334219383).

564531561 is a wasteful number, since it uses less digits than its factorization.

564531561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58901 (or 58898 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 564531561 is about 23759.8729163268. The cubic root of 564531561 is about 826.4744058574.

It can be divided in two parts, 5645315 and 61, that added together give a square (5645376 = 2376²).

The spelling of 564531561 in words is "five hundred sixty-four million, five hundred thirty-one thousand, five hundred sixty-one".